When you have a problem opening your door with your existing key chances are the your door latch to key tumbler rods might be missing. This is the part you need to replace. Danchuk # 15533 will work on any 1956 classic Chevy hardtop or convertible. Made in the USA.
Danchuk has the largest selection of quality 55, 56, 57 parts for your classic Chevy project.